/*
 * JavaScript MD5 1.0.1
 * https://github.com/blueimp/JavaScript-MD5
 *
 * Copyright 2011, Sebastian Tschan
 * https://blueimp.net
 *
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/MIT
 *
 * Based on
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

/*jslint bitwise: true */
/*global unescape, define */



/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y) {
  var lsw = (x & 0xFFFF) + (y & 0xFFFF),
      msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t) {
  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
}
function md5_ff(a, b, c, d, x, s, t) {
  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t) {
  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t) {
  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t) {
  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length.
 */
function binl_md5(x, len) {
  /* append padding */
  x[len >> 5] |= 0x80 << (len % 32);
  x[(((len + 64) >>> 9) << 4) + 14] = len;

  var i, olda, oldb, oldc, oldd,
      a =  1732584193,
      b = -271733879,
      c = -1732584194,
      d =  271733878;

  for (i = 0; i < x.length; i += 16) {
    olda = a;
    oldb = b;
    oldc = c;
    oldd = d;

    a = md5_ff(a, b, c, d, x[i],       7, -680876936);
    d = md5_ff(d, a, b, c, x[i +  1], 12, -389564586);
    c = md5_ff(c, d, a, b, x[i +  2], 17,  606105819);
    b = md5_ff(b, c, d, a, x[i +  3], 22, -1044525330);
    a = md5_ff(a, b, c, d, x[i +  4],  7, -176418897);
    d = md5_ff(d, a, b, c, x[i +  5], 12,  1200080426);
    c = md5_ff(c, d, a, b, x[i +  6], 17, -1473231341);
    b = md5_ff(b, c, d, a, x[i +  7], 22, -45705983);
    a = md5_ff(a, b, c, d, x[i +  8],  7,  1770035416);
    d = md5_ff(d, a, b, c, x[i +  9], 12, -1958414417);
    c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
    b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
    a = md5_ff(a, b, c, d, x[i + 12],  7,  1804603682);
    d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
    c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
    b = md5_ff(b, c, d, a, x[i + 15], 22,  1236535329);

    a = md5_gg(a, b, c, d, x[i +  1],  5, -165796510);
    d = md5_gg(d, a, b, c, x[i +  6],  9, -1069501632);
    c = md5_gg(c, d, a, b, x[i + 11], 14,  643717713);
    b = md5_gg(b, c, d, a, x[i],      20, -373897302);
    a = md5_gg(a, b, c, d, x[i +  5],  5, -701558691);
    d = md5_gg(d, a, b, c, x[i + 10],  9,  38016083);
    c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
    b = md5_gg(b, c, d, a, x[i +  4], 20, -405537848);
    a = md5_gg(a, b, c, d, x[i +  9],  5,  568446438);
    d = md5_gg(d, a, b, c, x[i + 14],  9, -1019803690);
    c = md5_gg(c, d, a, b, x[i +  3], 14, -187363961);
    b = md5_gg(b, c, d, a, x[i +  8], 20,  1163531501);
    a = md5_gg(a, b, c, d, x[i + 13],  5, -1444681467);
    d = md5_gg(d, a, b, c, x[i +  2],  9, -51403784);
    c = md5_gg(c, d, a, b, x[i +  7], 14,  1735328473);
    b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);

    a = md5_hh(a, b, c, d, x[i +  5],  4, -378558);
    d = md5_hh(d, a, b, c, x[i +  8], 11, -2022574463);
    c = md5_hh(c, d, a, b, x[i + 11], 16,  1839030562);
    b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
    a = md5_hh(a, b, c, d, x[i +  1],  4, -1530992060);
    d = md5_hh(d, a, b, c, x[i +  4], 11,  1272893353);
    c = md5_hh(c, d, a, b, x[i +  7], 16, -155497632);
    b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
    a = md5_hh(a, b, c, d, x[i + 13],  4,  681279174);
    d = md5_hh(d, a, b, c, x[i],      11, -358537222);
    c = md5_hh(c, d, a, b, x[i +  3], 16, -722521979);
    b = md5_hh(b, c, d, a, x[i +  6], 23,  76029189);
    a = md5_hh(a, b, c, d, x[i +  9],  4, -640364487);
    d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
    c = md5_hh(c, d, a, b, x[i + 15], 16,  530742520);
    b = md5_hh(b, c, d, a, x[i +  2], 23, -995338651);

    a = md5_ii(a, b, c, d, x[i],       6, -198630844);
    d = md5_ii(d, a, b, c, x[i +  7], 10,  1126891415);
    c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
    b = md5_ii(b, c, d, a, x[i +  5], 21, -57434055);
    a = md5_ii(a, b, c, d, x[i + 12],  6,  1700485571);
    d = md5_ii(d, a, b, c, x[i +  3], 10, -1894986606);
    c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
    b = md5_ii(b, c, d, a, x[i +  1], 21, -2054922799);
    a = md5_ii(a, b, c, d, x[i +  8],  6,  1873313359);
    d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
    c = md5_ii(c, d, a, b, x[i +  6], 15, -1560198380);
    b = md5_ii(b, c, d, a, x[i + 13], 21,  1309151649);
    a = md5_ii(a, b, c, d, x[i +  4],  6, -145523070);
    d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
    c = md5_ii(c, d, a, b, x[i +  2], 15,  718787259);
    b = md5_ii(b, c, d, a, x[i +  9], 21, -343485551);

    a = safe_add(a, olda);
    b = safe_add(b, oldb);
    c = safe_add(c, oldc);
    d = safe_add(d, oldd);
  }
  return [a, b, c, d];
}

/*
 * Convert an array of little-endian words to a string
 */
function binl2rstr(input) {
  var i,
      output = '';
  for (i = 0; i < input.length * 32; i += 8) {
    output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xFF);
  }
  return output;
}

/*
 * Convert a raw string to an array of little-endian words
 * Characters >255 have their high-byte silently ignored.
 */
function rstr2binl(input) {
  var i,
      output = [];
  output[(input.length >> 2) - 1] = undefined;
  for (i = 0; i < output.length; i += 1) {
    output[i] = 0;
  }
  for (i = 0; i < input.length * 8; i += 8) {
    output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << (i % 32);
  }
  return output;
}

/*
 * Calculate the MD5 of a raw string
 */
function rstr_md5(s) {
  return binl2rstr(binl_md5(rstr2binl(s), s.length * 8));
}

/*
 * Calculate the HMAC-MD5, of a key and some data (raw strings)
 */
function rstr_hmac_md5(key, data) {
  var i,
      bkey = rstr2binl(key),
      ipad = [],
      opad = [],
      hash;
  ipad[15] = opad[15] = undefined;
  if (bkey.length > 16) {
    bkey = binl_md5(bkey, key.length * 8);
  }
  for (i = 0; i < 16; i += 1) {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5C5C5C5C;
  }
  hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
  return binl2rstr(binl_md5(opad.concat(hash), 512 + 128));
}

/*
 * Convert a raw string to a hex string
 */
function rstr2hex(input) {
  var hex_tab = '0123456789abcdef',
      output = '',
      x,
      i;
  for (i = 0; i < input.length; i += 1) {
    x = input.charCodeAt(i);
    output += hex_tab.charAt((x >>> 4) & 0x0F) +
      hex_tab.charAt(x & 0x0F);
  }
  return output;
}

/*
 * Encode a string as utf-8
 */
function str2rstr_utf8(input) {
  return unescape(encodeURIComponent(input));
}

/*
 * Take string arguments and return either raw or hex encoded strings
 */
function raw_md5(s) {
  return rstr_md5(str2rstr_utf8(s));
}
function hex_md5(s) {
  return rstr2hex(raw_md5(s));
}
function raw_hmac_md5(k, d) {
  return rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d));
}
function hex_hmac_md5(k, d) {
  return rstr2hex(raw_hmac_md5(k, d));
}

function md5(string, key, raw) {
  if (!key) {
    if (!raw) {
      return hex_md5(string);
    }
    return raw_md5(string);
  }
  if (!raw) {
    return hex_hmac_md5(key, string);
  }
  return raw_hmac_md5(key, string);
}

export default md5;
